Calculation of critical parameters of the experimental stand ?FKBN?

2nd International (15th Regional) Scientific Conference "Technogenic Systems and Environmental Risk"

工业技术（总论）;生态环境科学

Aznabaev, V.K.^1 ; Kovalev, K.D.^1 ; Mishchukov, N.A.^1 ; Mishin, V.A.^1 ; Kolesov, V.V.^1

Department of Nuclear Physics and Technology, INPI NRNU MIPhI, 1 Studgorodok, Obninsk

249039, Russia^1

关键词: Chain reaction;    Critical assembly;    Critical state;    Fast neutrons;    Fissile materials;    Kinetic characteristics;    Los Alamos National Laboratory;    Oak Ridge laboratory;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/487/1/012003/pdf
DOI  :  10.1088/1757-899X/487/1/012003

来源: IOP

【 摘 要 】

The experimental stand ≤FKBN≥ (physical fast-neutron boiler) is a critical assembly in which the vertical lift mechanism is used. With the help of such stands, in the second half of the 20th century, experiments were conducted on the effect of various materials in various designs on the kinetic characteristics of a system with fissile material. Mostly, such works were conducted in Los Alamos National Laboratory (USA), Oak Ridge Laboratory (USA), VNIIEF (Russia), VNIITF (Russia). On such installations, there were often accidents with the emergence of a self-sustaining chain reaction. One of these occurred on April 5, 1968 in VNIITF in Chelyabinsk-70 (now Snezhinsk). In this paper, the critical state of the stand is calculated for different distances of the reflector from the core under the conditions of the presence and absence of solid polyethylene inside the core. The configurations in which Keff=1,000 and Keff=1,000+βeff are of interest are of interest. As a tool, the CSAS6 sequence of the SCALE-6.2.1 software package was used.